钢悬链式隔水管触地区隔水管-土相互作用的实践

Jinbo Chen, J. Newlin, Meng Luo, Heping Zhang, C. Hadley, Shuang Hu
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引用次数: 3

摘要

隔水管与土壤的相互作用对接触区(dzz)附近的钢制悬链线隔水管(SCR)的疲劳评估有重要影响,对于实现具有竞争力的SCR设计和延长SCR设计寿命至关重要。本文的目的是与立管工程界分享过去三十年来在立管-土壤相互作用方面积累的专有模型试验数据和研究/设计经验,以加深对这一复杂问题的理解,实现经济的SCR设计。目标是(i)提出一个完全非线性的迟滞模型,该模型捕捉了在TDZs的立管-土壤相互作用在垂直方向上的scr的加载历史,以及(ii)为TDZs的scr提出一个简化的等效线弹性垂直刚度,用于快速疲劳评估。本文从立管-土相互作用的非线性模型和等效线性模型的数学表达式入手。然后,通过张力腿平台SCR的时域和频域模拟预测结果的一致性,以及模型预测结果与小尺度管-土相互作用模型试验结果、缩小比例SCR截面模型试验结果和最新文献研究结果的一致性,对所提模型进行了验证。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Practice of Riser-Soil Interactions at Touch Down Zones for Steel Catenary Risers
Riser-soil interactions have significant influence on the fatigue assessment of steel catenary risers (SCRs) near the touch down zones (TDZs), and can be critical in realizing a competitive SCR design and in extending a SCR design life. The motivation of the paper is to share the proprietary model test data and research/ design experience accumulated over the past three decades on the riser-soil interactions with the riser engineering community in order to deepen the understanding of this complex problem and to realize economical SCR designs. The objectives are (i) to present a fully nonlinear hysteresis model that captures the loading history of the riser-soil interactions at TDZs in the vertical direction for SCRs, and (ii) to propose a simplified equivalent linear elastic vertical stiffness for SCRs at TDZs for quick fatigue assessments. The paper begins with the mathematical formulation of the nonlinear model and the equivalent linear model for riser-soil interactions. Then the proposed model is verified through the consistent predictions from time-domain and frequency-domain simulations of an SCR from a Tension Leg Platform (TLP), the close agreement between the proposed model predictions and small scale pipe-soil interaction model test results, reduced scale sectional SCR model test results, and the latest study in the literature.
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